yashsingh1/xdaforums huggingface dataset:
[Nook Color General] victle:
CM7 works great on all of my uSD cards, running smoothly, never got problem with Pulse, rarely got FC. The cards are from 2GB to 8GB, from no-class to class 6. I don't have any 16GB or class 10 card though.

Here are the results

Card (Random read 4KB-QD32 / Random write 4KB-QD32)

Kingston 2GB no class (4.689 / 0.051)

Transcend 4GB Class 6 (5.292 / 0.034)

PNY 8GB Class 4 (4.061 / 0.028)

Dane-Elec 2GB no class (slightly worse than the Kingston 2GB)

I'm using the PNY 8GB right now because it's the largest capacity of mine. Running the CM7 beta version with .32 kernel

I heard that many people got problem with 16GB class 10. I guess class 2 or class 4 card seems to work better.
[Nook Color General] MickMcGeough:
I found out today that not all Sandisk cards are created equal.

I bought Sandisk uSD 8GB Class 2 w/ adapter with Wake Up Your Phone branding on the adapter today. Here's how it did in XBench (not sure about QD):

4K Uncached Random Read: 4.10 MB/s

4K Uncached Random Write: 0.02 MB/s

Took it back and got a plain old Sandisk brand uSD 8GB Class 4 w/ adapter.

4K Uncached Random Read: 4.17 MB/s

4K Uncached Random Write: 1.59 MB/s
[Nook Color General] Ravynmagi:
Yeah, I also thought it seemed odd that my 4K write was much lower and all my mSD cards seemed to have similar results in that particular test. I did test multiple times using two different computers.

Custom build desktop doesn't have SD card reader, so I use a Rosewill USB SDHC reader. My Dell Latitude E6410 laptop has an SD card reader, which I used for the test. Both computers though gave very similar results in CDM 3.0.1.

I restested the Sandisk 8GB C2 card again on those two computers and I also tried it on a Dell Inspiron 580S desktop using it's SD card reader. Same result as the previous two computers.

I also found another Sandisk 4GB C2 card. I tested it and also got 0.030 with the 4KQD32 write test.

One thing that might be the problem is that both of these Sandisk cards are old, 3 years, maybe 4 years old.

PS. That ?? 4GB C2 card I couldn't identify, it wasn't labeled. I know what it is now. It's a Samsung. I just realized I have a Samsung SD card adapter, but no Samsung microSD card, so am very sure that unlabeled card must be the Samsung one that came with a Samsung phone (also probably 3 years old).
[Nook Color General] pryonix:
Just want to share my result. Cards are brand new, never been used, and just formatted prior to testing except for the last card which came with my LG Optimus One.

CrystalDiskMark 3.0.1 was used.

Quick conclusions: generic 2GB Samsung microSD card that came with LG Optimus One performed 3x better than the more expensive microSDs.

Transcend Premium 8GB class 6

Sequential Read : 11.275 MB/s

Sequential Write : 9.205 MB/s

Random Read 512KB : 11.261 MB/s

Random Write 512KB : 1.363 MB/s

Random Read 4KB (QD=1) : 1.942 MB/s [ 474.1 IOPS]

Random Write 4KB (QD=1) : 0.015 MB/s [ 3.6 IOPS]

Random Read 4KB (QD=32) : 2.018 MB/s [ 492.7 IOPS]

Random Write 4KB (QD=32) : 0.033 MB/s [ 8.0 IOPS]

Test : 50 MB [E: 0.0% (0.0/7628.1 MB)] (x5)

Kingmax 16GB Class 10

Sequential Read : 15.597 MB/s

Sequential Write : 12.433 MB/s

Random Read 512KB : 15.868 MB/s

Random Write 512KB : 3.147 MB/s

Random Read 4KB (QD=1) : 3.306 MB/s [ 807.2 IOPS]

Random Write 4KB (QD=1) : 0.026 MB/s [ 6.3 IOPS]

Random Read 4KB (QD=32) : 3.750 MB/s [ 915.6 IOPS]

Random Write 4KB (QD=32) : 0.036 MB/s [ 8.7 IOPS]

Test : 50 MB [E: 0.0% (0.0/14.7 GB)] (x5)

Samsung 2GB (No class specified but is most likely Class 2) that came by default with my LG Optimus One

Sequential Read : 9.464 MB/s

Sequential Write : 3.463 MB/s

Random Read 512KB : 9.457 MB/s

Random Write 512KB : 1.440 MB/s

Random Read 4KB (QD=1) : 1.362 MB/s [ 332.5 IOPS]

Random Write 4KB (QD=1) : 0.097 MB/s [ 23.8 IOPS]

Random Read 4KB (QD=32) : 1.628 MB/s [ 397.5 IOPS]

Random Write 4KB (QD=32) : 0.093 MB/s [ 22.7 IOPS]

Test : 50 MB [E: 79.8% (1519.5/1905.3 MB)] (x5)
[Nook Color General] pryonix:
I bought a SanDisk Class4 8GB today after posting my results and I feel like crying when the results came back...

Sequential Read : 9.683 MB/s

Sequential Write : 5.636 MB/s

Random Read 512KB : 9.694 MB/s

Random Write 512KB : 1.543 MB/s

Random Read 4KB (QD=1) : 2.745 MB/s [ 670.2 IOPS]

Random Write 4KB (QD=1) : 0.536 MB/s [ 130.9 IOPS]

Random Read 4KB (QD=32) : 2.723 MB/s [ 664.8 IOPS]

Random Write 4KB (QD=32) : 0.625 MB/s [ 152.6 IOPS]

Test : 50 MB [F: 0.0% (0.0/7572.0 MB)] (x5)

Results are much much faster than my 3 other SD cards but it's still 0.625 MB/s compared to the 1.2-1.7 MB/s others are getting with their SanDisks...
[Nook Color General] magnamagna:
This thread should be pinned: specifically the list of cards and their bench results. I was amazed at what a difference changing my SD card made.

I essentially went from "unusable" to "decent". Now I am looking to achieve "blazing".

Ideally, it would nice if we could throw around some online retailers/URLs to find the best one.
[Nook Color General] :
No actua benchmark testing done yet but I'm running CM7 Nightly 74 off my Transcend 8GB Class 6 SD card. I'm not really experiencing any of the reported force close issues or extreme browser and marketplace lag. A few hiccups here and there but it already "feels" better than the stock BN 1.2. :shrugs:

Maybe I just don't know any better. Pulse hasn't force closed on me once. Are the people having force close issues maybe overclocking?
[Nook Color General] magnamagna:
I will probably be making a purchase from the Egg pretty soon. If we could nail down a good source, it would be handy.

Here is a list of Sandisks for sale:

http://bit.ly/lMNaav

NOTE:This is not an advert, just a plea from a thrifty consumer!
[Nook Color General] victle:
I never got problem with CM7 running on my 4 uSD cards, with or without OC. Never got problem with Pulse. Is there difference in performance due to the sdcard image structure/partitions format?

A lot of people have good feedback on Sandisk card thanks to its superior small block random write performance. So this might be a solid option for one who is looking for a new card. However, if you have an old card, give it a try. I find the old 2GB no class card work decently.
[Nook Color General] a.fenderson:
I fear swoozle (the OP) may have abandoned us, but if not or if an admin who wants to sticky this thread could do so, I'd be glad for someone to copy and paste the list I keep updating to the end of the first post. Speaking of that:

POSTER	BRAND	CLASS	CAPACITY (GB)	4 KB RANDOM WRITE QD32 (MB/s)	NOTE
swoozle	SanDisk	2	8	1.791
a.fenderson	SanDisk	4	16	1.660	SanDisk C4 16GB 1 of 2 cards
MickMcGeough	SanDisk	4	8	1.59	benchmarked in XBench, QD unknown
a.fenderson	SanDisk	4	16	1.500	SanDisk C4 16GB 2 of 2 cards
Awats	SanDisk	4	16	1.391	SanDisk C4 16GB 1 of 2 cards ; fastest (onboard) reader
arwild01	SanDisk	4	8	1.369
Awats	SanDisk	4	16	1.284	SanDisk C4 16GB 2 of 2 cards ; fastest (onboard) reader
robot8	SanDisk	4	8	1.270	SanDisk C4 8GB 2 of 2 cards
robot8	SanDisk	4	8	1.259	SanDisk C4 8GB 1 of 2 cards
chinly43	SanDisk	4	16	1.257	(not via Nook) ; same card as chinly43's other listed SanDisk C4 16GB
joobu	SanDisk	4	4	1.175
angomy	Nook internal	N/A	N/A	1.116	via Nook on USB
chinly43	Nook internal	N/A	N/A	1.094	via Nook on USB
a.fenderson	Transcend	2	32	1.032
a.fenderson	SanDisk	4	4	0.898
a.fenderson	SanDisk	2	4	0.891
pchoi94	SanDisk	4	16	0.834
chinly43	SanDisk	4	16	0.769	via Nook on USB ; same as chinly43's other listed SanDisk C4 16GB
pryonix	SanDisk	4	8	0.625
chinly43	SanDisk	2	8	0.616
a.fenderson	SanDisk	4	8	0.596
angomy	SanDisk	4	16	0.574
Blue6IX	SanDisk	2	16	0.350
a.fenderson	SanDisk	N/A	2	0.269
Awats	SanDisk	4	2	0.261	SanDisk C4 2GB 1 of 2 cards ; fastest (onboard) reader
Awats	SanDisk	4	2	0.236	SanDisk C4 2GB 2 of 2 cards ; fastest (onboard) reader
pryonix	Samsung	N/a	2	0.093
victle	Kingston	N/A	2	0.051
victle	Dane-Elec	N/A	2	0.050	0.050 or less: exact value unspecified
joobu	Lexar	4	8	0.038
swoozle	Patriot	10	8	0.038
Blue6IX	Dane-Elec	4	4	0.037	(made in Japan)
omghahalol	Transcend	6	16	0.037
Ravynmagi	Samsung(??)	2	4	0.037
pryonix	Kingmax	10	16	0.036
Ravynmagi	Wintech	10	16	0.036
victle	Transcend	6	4	0.034
omghahalol	Transcend	6	8	0.033
Ravynmagi	SanDisk	2	8	0.033
pryonix	Transcend	6	8	0.033
Ravynmagi	Patriot	10	16	0.030
Blue6IX	PNY	10	8	0.030
pchoi94	Kingston	2	16	0.030
swoozle	Transcend	6	8	0.029
joobu	??	N/A	2	0.029
chinly43	SanDisk	N/A	1	0.029
a.fenderson	SanDisk	N/A	1	0.028
victle	PNY	4	8	0.028
Blue6IX	PNY	N/A	2	0.027	(made in Taiwan)
omghahalol	SanDisk	2	2	0.021
MickMcGeough	SanDisk	2	8	0.02	benchmarked in XBench, QD unknown
robot8	Transcend	6	8	0.018	Transcend C6 8GB 1 of 2 cards
ExploreMN	Patriot	10	16	0.018
arwild01	Samsung(??)	4	8	0.017
swoozle	Kingston	4	4	0.016
Awats	Patriot	4	4	0.016	Patriot C4 4GB 1 of 2 cards ; fastest (onboard) reader
robot8	Transcend	6	8	0.014	Transcend C6 8GB 2 of 2 cards
Tnexus	Patriot	10	16	0.014
a.fenderson	Kingston	4	8	0.014
Awats	Patriot	4	4	0.011	Patriot C4 4GB 2 of 2 cards ; fastest (onboard) reader
chinly43	Lexar	4	8	0.011
[Nook Color General] swoozle:
Naw, I was actually trying to figure out last night how to paste your excellent table in the 1st post (with attribution of course) but couldn't. I'll link to this post at the very least (and try to keep it up to date as you do).

Edit: Success, the table is in the first post.
[Nook Color General] maxwintrobe:
wow right on just did cm7 install sandisk 4gb class 4 - way better than last time tried with pny
[Nook Color General] chungylau:
amazon has good prices on Sandisk uSD's.
[Nook Color General] swoozle:
Here are the model numbers from at least some of the cards I benchmarked. I'll add them to a.fenderson's table in the first post.

Sandisk Class 4 8G SDSQ-8192-AC11M

Transcend Class 6 8G TS8GUSDHC6

Kingston Class 4 8G SDC4/8GB
[Nook Color General] Blue6IX:
So I went out and bought another card tonight, 17.99 on sale at my local radio shack.

Same adapter and computer state as when I ran the other benchmarks.

Sandisk MicroSDHC Class 4, 8 Gig - that famous card.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 7.342 MB/s

Sequential Write : 4.742 MB/s

Random Read 512KB : 7.161 MB/s

Random Write 512KB : 3.845 MB/s

Random Read 4KB (QD=1) : 1.014 MB/s [ 247.7 IOPS]

Random Write 4KB (QD=1) : 0.591 MB/s [ 144.2 IOPS]

Random Read 4KB (QD=32) : 0.997 MB/s [ 243.4 IOPS]

Random Write 4KB (QD=32) : 0.579 MB/s [ 141.4 IOPS]

Test : 50 MB [F: 0.0% (0.0/7572.0 MB)] (x5)

Date : 2011/05/20 21:04:45

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

Test results seem to help prove out it's the luck of the draw. Seems like the best card i've got for read/write QD=32, i'll mimick my current daily driver onto this one and see how it goes.
[Nook Color General] Ravynmagi:
Welp, just got back from Radio Shack with a new Sandisk 16GB C4 card.

Sequential Read : 11.980 MB/s
Sequential Write : 6.269 MB/s
Random Read 512KB : 11.846 MB/s
Random Write 512KB : 1.571 MB/s
Random Read 4KB (QD=1) : 3.214 MB/s [ 784.7 IOPS]
Random Write 4KB (QD=1) : 1.174 MB/s [ 286.7 IOPS]
Random Read 4KB (QD=32) : 3.010 MB/s [ 734.8 IOPS]
Random Write 4KB (QD=32) : 1.034 MB/s [ 252.5 IOPS]

Test : 50 MB [E: 0.0% (0.0/14.8 GB)] (x5)
Date : 2011/05/20 18:54:25
OS : Windows 7 Enterprise Edition [6.1 Build 7600] (x64)
[Nook Color General] joobu:
I'd just like to highlight that there are a LOT of fake and marginal SD cards. One number floating around is that a third of Sandisk cards are fakes. It's probably best to buy from a reputable seller.

This is a (long) analysis on Kingston cards:

http://www.bunniestudios.com/blog/?p=918
[Nook Color General] cameraz:
Happy camper

Today I installed CM7 stable 7.0.3 on a Sandisk 8GB Class 4 card, and everything is running very smoothly. I couldn't be happier.

Previously, I had CM7 on a Transcend 8GB Class 6 card, and it worked well for about two weeks. Then everything went haywire -- practically every app I tried would FC, and my wifi wouldn't connect. It's strange that the card initially worked fine and then something went wrong.

I had an identical Transcend card with froyo on it, and it too worked fine for a couple of weeks, then went bad the same day my CM7 card did. :confused:

But I'm keeping my fingers crossed with the Sandisk card. Spent most of the day tweaking and customizing my NC to get it just the way I want it. :D

By the way, I purchased my Sandisk card from B&H Photo. They're pretty reliable and have authentic stuff.
[Nook Color General] Windsor1959:
I wanted to try CM7 on an SD card, but the only one I could find nearby was an 8GB Class 4 PNY card. CM7 is running surprisingly well so far. I have ordered a SanDisk card. I then found this thread and learned about Crystal Disk Mark. I installed that on my laptop, but when I tested my PNY card with it, I kept getting an error. I think that, with CM7 already installed on the card, CrystalDiskMark can't find enough free space for its tests. I am looking forward to see if my new SanDisk is even better!
[Nook Color General] a.fenderson:
What kind of error? The only time I tried to run one and didn't have enough free space on the card, CrystalDiskMark reported exactly that info so that I could (and did) correct the issue and then test successfully.
[Nook Color General] dtbrewer:
Here are the CrystalDiskMark results tested in my card reader integrated into my Dell Monitor. I wasn't sure what the parameters people were using for Crystal (oh, now I see it at the bottom). I used 3 repeats and 50MB per test so it didn't take forever.

Toshiba micro SDHC 8 GB Class 4 (from Sam's Club in MN) labeled: C08G Taiwan

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 7.561 MB/s

Sequential Write : 3.076 MB/s

Random Read 512KB : 7.466 MB/s

Random Write 512KB : 0.652 MB/s

Random Read 4KB (QD=1) : 1.258 MB/s [ 307.1 IOPS]

Random Write 4KB (QD=1) : 0.006 MB/s [ 1.4 IOPS]

Random Read 4KB (QD=32) : 1.318 MB/s [ 321.7 IOPS]

Random Write 4KB (QD=32) : 0.017 MB/s [ 4.1 IOPS]

Test : 50 MB [P: 0.0% (0.0/7570.5 MB)] (x3)

Date : 2011/05/21 19:41:44

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

Here is the same data with 5 repeats instead of 3, essentially no difference.

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 7.332 MB/s

Sequential Write : 3.088 MB/s

Random Read 512KB : 7.267 MB/s

Random Write 512KB : 0.649 MB/s

Random Read 4KB (QD=1) : 1.256 MB/s [ 306.6 IOPS]

Random Write 4KB (QD=1) : 0.006 MB/s [ 1.4 IOPS]

Random Read 4KB (QD=32) : 1.309 MB/s [ 319.6 IOPS]

Random Write 4KB (QD=32) : 0.017 MB/s [ 4.2 IOPS]

Test : 50 MB [P: 0.0% (0.0/7570.5 MB)] (x5)

Date : 2011/05/22 11:18:08

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

You would think Toshiba should know what they are doing, but I guess not!

Dave
[Nook Color General] Windsor1959:
Here's the error: 0x00000017: Data error (cyclic redundancy check)

I tried a test with my other SD card, a Transcend 8GB Class 6. I got the same error when using 5 test runs and a 100MB test size. But, when I set it for two test runs and 50MB, no error. The PNY had this error at both settings.
[Nook Color General] dtbrewer:
Now another one.

Transcend micro SD 2 GB (no class marking) MM8GR02GUBCA-MA

Made in Korea

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 8.975 MB/s

Sequential Write : 4.800 MB/s

Random Read 512KB : 8.939 MB/s

Random Write 512KB : 1.902 MB/s

Random Read 4KB (QD=1) : 2.163 MB/s [ 528.1 IOPS]

Random Write 4KB (QD=1) : 0.024 MB/s [ 5.8 IOPS]

Random Read 4KB (QD=32) : 2.135 MB/s [ 521.2 IOPS]

Random Write 4KB (QD=32) : 0.038 MB/s [ 9.3 IOPS]

Test : 50 MB [P: 17.7% (346.3/1953.7 MB)] (x3)

Date : 2011/05/21 20:30:36

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)
[Nook Color General] dtbrewer:
One last one for today (confirming the Sandisk theory).

Sandisk 4 GB micro SDHC Class 4 BH Made in Taiwan

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 (C) 2007-2010 hiyohiyo

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 8.760 MB/s

Sequential Write : 4.652 MB/s

Random Read 512KB : 8.722 MB/s

Random Write 512KB : 1.537 MB/s

Random Read 4KB (QD=1) : 1.901 MB/s [ 464.2 IOPS]

Random Write 4KB (QD=1) : 0.925 MB/s [ 225.9 IOPS]

Random Read 4KB (QD=32) : 1.869 MB/s [ 456.3 IOPS]

Random Write 4KB (QD=32) : 0.787 MB/s [ 192.2 IOPS]

Test : 50 MB [P: 0.0% (0.0/3773.5 MB)] (x5)

Date : 2011/05/21 22:21:52

OS : Windows XP Professional SP3 [5.1 Build 2600] (x86)

I think I will take this card out of my Marine GPS and use it for the Nook for now!
[Nook Color General] swoozle:
CM7 benchmark?

It would be nice if there was a way of benchmarking CM7 performance to quantify the differences between these cards. I'm not talking the canned benchmarks like quadrant that don't capture realistic delays that you would see in standard use, more like a reproducible standard action like running a specific app.

Or maybe there is a benchmarking app that does the same thing?
[Nook Color General] :
For those that have only posted benchmarks, has the Sandisk SD card really stopped these issues (i.e. lagging apps, browsing, force closing)? (I know some of you have stated it has)

What apps consistently force close for people?

Transcend 8GB Class 6 from Amazon

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 13.887 MB/s

Sequential Write : 7.559 MB/s

Random Read 512KB : 10.889 MB/s

Random Write 512KB : 1.460 MB/s

Random Read 4KB (QD=1) : 1.255 MB/s [ 306.5 IOPS]

Random Write 4KB (QD=1) : 0.013 MB/s [ 3.2 IOPS]

Random Read 4KB (QD=32) : 2.851 MB/s [ 696.0 IOPS]

Random Write 4KB (QD=32) : 0.027 MB/s [ 6.7 IOPS]

Test : 50 MB [F: 9.9% (11.4/115.8 MB)] (x5)

Date : 2011/05/22 18:01:01

OS : Windows 7 Enterprise Edition [6.1 Build 7600] (x64)

Sandisk 8GB Class 4 from Radio Shack

-----------------------------------------------------------------------

CrystalDiskMark 3.0.1 x64 (C) 2007-2010 hiyohiyo

Crystal Dew World : http://crystalmark.info/

-----------------------------------------------------------------------

* MB/s = 1,000,000 byte/s [SATA/300 = 300,000,000 byte/s]

Sequential Read : 8.044 MB/s

Sequential Write : 4.955 MB/s

Random Read 512KB : 7.727 MB/s

Random Write 512KB : 4.019 MB/s

Random Read 4KB (QD=1) : 0.948 MB/s [ 231.5 IOPS]

Random Write 4KB (QD=1) : 0.610 MB/s [ 148.9 IOPS]

Random Read 4KB (QD=32) : 0.875 MB/s [ 213.7 IOPS]

Random Write 4KB (QD=32) : 0.612 MB/s [ 149.5 IOPS]

Test : 50 MB [F: 0.0% (1.7/7572.0 MB)] (x5)

Date : 2011/05/22 19:09:19

OS : Windows 7 Enterprise Edition [6.1 Build 7600] (x64)
[Nook Color General] For_the_moves:
Ok, so how I ensure that I get an authentic class 2 SanDisk card when shopping on Amazon? Specifically a SDSQ-8192-AC11M like swoozle's? The best I've seen is this but it doesn't look authentic.
[Nook Color General] magnamagna:
That link sends me to an SDHC card (not a micro card). Is this the one you were suggesting?
[Nook Color General] :
Maybe I'm jumping the gun here (its only been a few hours since I started using the new Sandisk SD card) but I think I'm officially on the bandwagon.

Even though my Sandisk 8GB class 4 card doesn't benchmark quite as well as some of the others in this thread (0.6 Random writes), this thing has been rock solid. A few things I noticed:

- it does seem like my NC takes a little more time to boot now. some things also take slightly longer to load BUT this is way better than the stuttering that was occurring at random before and Force closes

- quadrant scores dropped slightly from the 2500s to 2400s. But I'm not sure what those tests entail...

- pulse is no longer un responsive and I have not experienced one FC after the update. Same with Words with friends.

- no stuttering during the CM7 boot video. with my old transcend sd card you could see that the spinning arrow would slow down at points.

Knock on wood.
[Nook Color General] Windsor1959:
Count me on the SanDisk bandwagon, too. I was using a PNY card and I thought that it did well. That was because I was comparing that experience with running HC off the SD card. But I now have a 16GB Class 4 SanDisk, and I see a definite improvement : smoother, faster, more stable. My CrystalDiskMark tests confirmed my impressions. The SanDisk scored a 1.034 on the 4k random write, while my PNY scored a 0.029 on the same test (identical with my Transcend 8GB Class 6). The PNY is a 8GB Class 4. Enough evidence to convince this jury!
[Nook Color General] Blue6IX:
For me, unless i'm using a sandisk card out of the few I have, the default gallery force closes when loading pictures. ( I have around 200 pictures at an obscene resolution from my digital camera on it)

I had to use alternate gallery apps just to view my pictures, but with the sandisk cards I have (the 16 gig and 8 gig) the default gallery loads those same pics fine.

Jet car stunts wouldn't work on any install but my sandisk installs.

Minisquadron special edition wouldn't work on any but the sandisk cards, but the regular version works on my pny class 10 card.

Picsay Pro got some random force closes that went away when I started using my sandisk card. Same with ToonPaint.

That's all I can think of off the top of my head without having my coffee yet this morning.
[Nook Color General] dtbrewer:
Yes, Yes it is better. I first tried the Toshiba card benchmarked in post 155. I had all of the problems reported due to slow Random Writes on the SD card: Force Closes or Wait messages, very slow Market downloads on the order of an hour per app, GMail would never Sync, just in general unusable.

I switched to the Sandisk card benchmarked in post 158 (I think) and it was a huge difference. Everything just works. Market download of 8 of the Google apps in less than 5 minutes. No Force Close, GMail works, Calendar works. I am much happier. [Using the verygreen CWR image with CM7 7.1 beta 3.1]

Dave
[Nook Color General] light_n_roses:
I have just benchmarked my sandisk class 4 16 gb card bought in the same store ( amazon ) and couldn't be able to go after 0.862 in the random write test while many users reports value of 1.6 ...is maybe because of the card reader ? Because I remember one post in which a user underscore that with different card reader he obtained very different results !
[Nook Color General] :
The card reader probably won't improve your score. The sandisk scores reported in this thread vary anywhere from 0.5 - 1.7. If you're not having force close, stuttering, or other miscellaneous performance issues your card is fine. Fast random write performance is not guaranteed on any of these.
[Nook Color General] LBN1:
Just adding my tests for the chart results...

Random (4k/QD32) Test results:	Read	/	Write

Sandisk 2.0gb (no class rating)	.995	/	.066

Kingston 16gb Class 4	.984	/	.047

Sandisk 16gb Class 4	.945	/	.736